From: Kangjie Lu <kangjielu@xxxxxxxxx>
commit 681fef8380eb818c0b845fca5d2ab1dcbab114ee upstream.
The stack object “ci” has a total size of 8 bytes. Its last 3 bytes
are padding bytes which are not initialized and leaked to userland
via “copy_to_user”.
CVE-2016-4482
Signed-off-by: Kangjie Lu <kjlu@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[ciwillia@xxxxxxxxxxx: backported to 3.14: adjusted context]
Signed-off-by: Charles (Chas) Williams <ciwillia@xxxxxxxxxxx>
---
drivers/usb/core/devio.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 8016aaa..a787664 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1104,10 +1104,11 @@ static int proc_getdriver(struct dev_state *ps, void __user *arg)
static int proc_connectinfo(struct dev_state *ps, void __user *arg)
{
- struct usbdevfs_connectinfo ci = {
- .devnum = ps->dev->devnum,
- .slow = ps->dev->speed == USB_SPEED_LOW
- };
+ struct usbdevfs_connectinfo ci;
+
+ memset(&ci, 0, sizeof(ci));
+ ci.devnum = ps->dev->devnum;
+ ci.slow = ps->dev->speed == USB_SPEED_LOW;
if (copy_to_user(arg, &ci, sizeof(ci)))
return -EFAULT;
--
2.5.5
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